FAIR VALUE - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fixed rate debt greater (less) than carrying value	$ (20.0)	$ 130.0
Fixed rate debt carrying value	$ 2,082.9	$ 2,082.3

Fixed Rate Debt, Amount Greater (Less) Than Carrying Value Net

No definition available.

Name:	leg_FixedRateDebtAmountGreaterLessThanCarryingValueNet
Namespace Prefix:	leg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant